And finding truck drivers to distribute these supplies is hard. A spokesperson for Rosselló told CNN only 20 percent of drivers have gone back to work since the hurricane.

Contacting the drivers also hasn't been easy. The Federal Communications Commission said Wednesday more than 91 percent of cellphone sites are down.

And then there's the issue of getting the trucks on the road. The island has a severe gasoline shortage, and many roads are either blocked or damaged.

More aid is is on the way. The Trump administration is sending more military personnel and ships to the island. And on Thursday, President Donald Trump agreed to loosen shipping restrictions for Puerto Rico after critics argued relief efforts were hindered.